Robins MCI Engine

[spread footing]

Hey all, I've been having some discussions with Mike of Mikes Motor Toys and he's been of great assistance tracking down the proper part no. for the muffler I need. Apparently on my (alledged) 1997 Jacobsen Hauler (there's no serial number tag, so I'm flyin blind), the engine must have been swapped somewhere along the lines, because the muffler I ordered based on the information I had did not fit (look for it soon in the parts for sale section, brand new, deep discount). Turns out according to Mike that I have an MCI engine, Subaru Robins model No. EH352. Does anybody have any info about these engines? The muffler I ordered is a 72019-G01 which on most sites say good for EZ-Go's from the 90's (I guess when they went to 4 stroke) onward (I just dont' know how far onward). If anybody's got any light they can shed so I can enlighten myself it would be most appreciated.